AT1799
2A Step-Down Voltage Regulator
Feature
Description
‧
4.75V to 16V Supply Voltage Operating
AT1799 is a voltage-mode PWM step-down
DC-DC converter capable of driving up to 2A
Range.
over
input supply range with excellent
‧
380KHz
±15%
Fixed Switching Frequency. loads and a wideregulation characteristics. High
line
load
‧
Voltage-Mode PWM Step-Down Regulator. efficiency is obtained through the use of a low
‧
Built-in Power MOSFET, Rds(on)≒100mΩ. Rds(on) P-channel power switch.
‧
2A Output Current, Up to 91.9% Efficiency
It uses a fixed switching frequency up to 380KHz
‧
1.215V±1.5% Internal Reference
thus allowing smaller sized components. The
‧
Shutdown Current less than 20uA.
output
via an
‧
Thermal-Shutdown and Built-in Soft-Start. externalvoltage level is user-programmable built-in
resistive voltage divider. The
‧
Cycle-by-Cycle Current-Limit Protection.
soft-start can reduce inrush current on the input
‧
Short Circuitry Protection.
source at turn on.
‧
Under-Voltage Lockout Protection.
‧
Output Voltage Adjustable From 1.215V to The device also has built-in cycle-by-cycle
current-limit, thermal shutdown, under-voltage
16V.
lockout and an ON/OFF logic-control that can
‧
SOP-8 Package.
power down the regulator to a shutdown mode. In
shutdown mode the regulator draws less than 20uA
of supply current. When a short circuit is detected
Application
on the output , the device immediately change
‧
Distributed Power Systems
switching frequency to 42 KHz and duty cycle is
‧
Battery Charger.
limited to 5% to protect IC from damage.
‧
Palmtop Computers, PDAs.
‧
DSL Modems
AT1799 is available in SOP-8 package.
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
8/23/2006 REV:1.1
Email:
service@aimtron.com.tw
1
AIMTRON [ AIMTRON TECHNOLOGY ]
